What are some common mistakes in database queries?
An example of an AI chatbot conversation about common mistakes in database queries.
What are some common mistakes in database queries?
Some common mistakes include using SELECT * instead of specifying columns, not using indexes, and forgetting to handle NULL values.
Can you explain why using SELECT * is a bad practice?
Using SELECT * retrieves all columns, which can lead to performance issues and unnecessary data transfer. It's better to specify only the needed columns.
What about indexing? How does it help?
Indexing improves query performance by allowing the database to find rows faster, reducing the amount of data scanned.
What are some other mistakes to avoid?
Other mistakes include not using proper joins, failing to sanitize inputs, and neglecting to optimize queries for performance.
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